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Exhaust› Headers, Manifolds and Components

STI

Exhaust Manifold

$927.15 $508.78 Save $418.37

SKU: 21820AA340

Special Order
Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

If your turbocharged Subaru exhibits reduced acceleration or a hissing sound during acceleration, coupled with a check engine light, this component may require replacement.
Show original supplier description
The Genuine Subaru Inter Cooler Assembly (part number 21820AA340) is a direct replacement component engineered for turbocharged Subaru vehicles. Its primary function is to ensure the engine receives cool, dense air, which is crucial for optimal performance and power output. Signs that your intercooler may need attention include a noticeable reduction in acceleration, a hissing sound during acceleration, or the illumination of the check engine light. This intercooler is compatible with a range of Subaru models equipped with a turbocharger. Specifically, it fits the 2006-2008 Subaru Forester (Sports, XT trims) and the 2006-2007 Subaru Impreza (WRX, WRX TR, and STI trims) with the 2.5L H4 Turbo engine. Installation involves removing intercooler mounting bolts and loosening hose clamps securing the ducts, with specific steps detailed for Forester and Impreza models regarding PCV hoses, turbocharger inlet duct, and air bypass valve connections. It's important to note that this part is listed as discontinued by the manufacturer. The item weighs 3.20 pounds and is guaranteed by Subaru's factory warranty, typically a 12-month/12,000-mile term, and carries manufacturer certification.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSTI
Part Number21820AA340
CategoryExhaust
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Returns & Fitment

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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